Getting return undefined on recursive function javascript

Question

I heard recursive function is powerful so instead going through loop i tried to create a function which increments a number until it reach certain points. when it reaches i trie

Answer 1

Well you could just use the return statement and you can check the code in the console like

var i=1;
function rec(){
i++;
console.log(i);
if(i > 100){
    return i;
}else{
    return rec();
}
}

console.log(rec());